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Sustain Drive with Reduced Peak Sustain Current and Full Sustain Margin

Publishing Venue

IBM

Related People

Criscimagna, TN: AUTHOR

Abstract

By using a controlled notch in the sustain waveform followed by a spike pulse, the sustaining function is modified to: - reduce the sustain peak current, - maintain average sustain current, and - maintain the sustain operating margin of the panel.

Country

United States

Language

English (United States)

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Sustain Drive with Reduced Peak Sustain Current and Full Sustain Margin

By using a controlled notch in the sustain waveform
followed by a spike pulse, the sustaining function is modified to:
- reduce the sustain peak current,
- maintain average sustain current, and
- maintain the sustain operating margin of the panel.

A plasma display storage device is described in the IBM Technical Disclosure
Bulletin 15, 2516-2517 (January 1973). The trend today is to increase both the
size and the resolution of plasma displays. The impact of this trend on gas
panels is to increase the number of pels (picture elements) , which thereby
increases the current required to sustain the panel. This requires higher
powered or multiple sustainers and selection circuits that can pass the higher
sustain current. In both cases, the end result is an increase in the cost of the
display. In addition to the above, the problem of economically sustaining all of
the panel cells still exists. This article proposes to reduce the peak current
required to sustain the panel cells without adversely affecting the panel sustain
margin.

It is well known in the art that if the output impedance of the sustainer or the
selection circuits is too high, the sustain waveform will have "notches," as shown
in Fig. 1. These notches occur at avalanche current time and decrease the drive
to the cells, thereby reducing the wall charge stored in the dielectric capacitors as
well as the sustain margin (bistable operating range) of the panels. If the lost
margin could be recovered after the notch occurs, the net effect would be to
reduce the peak avalanche current without affecting pan...